<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        *{
            margin: 0px;
            padding: 0px;
            list-style: none;
        }
        .header{
            width: 100%;
            background-color:rgb(255, 133, 42);
        }
        .header li{
            width: 100%;
            background-image: url(); 
            background-repeat: no-repeat;
            background-position: 9px center;
            background-size: 27px 20px;
            padding: 6px 9px 6px 42px;
        }
        .header li input{
            width: 349px;
            height: 25px;
            display: block;
            background: rgb(255, 78, 34);
            text-align: center;
            outline: none;
            border: 0px;
            border-radius: 4px;
        }
        .header li input::-webkit-input-placeholder{
         color: rgb(240, 224, 220);
         font-size: 13px;
        }
    </style>
</head>
<body>
    <div class="header">
        <li>
            <input type="text" placeholder="寻找宝贝店铺">
        </li>
    </div>

    <div class="nav">

    </div>


</body>
</html>